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A ship A is moving westwards with a spee...

A ship A is moving westwards with a speed of `10 km h^(-1)` and a ship B 100 km south of A, is moving northwards with a speed of `10 km h^(-1)` The time after which the distance between them becomes shortest, is

A

`5sqrt2 h`

B

`10sqrt2 h`

C

0 h

D

5 h

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